Game Development Reference
In-Depth Information
a widely used quality metric in video coding. But the problem is that sometimes
PSNR may not reflect the visual quality well. As the perceptual quality is highly
dependent on the human visual system, which is still a too complex problem to model
accurately, the research on objective visual quality metric is a hot topic. Some well-
known perceptual quality metrics are the Sarnoff JND (just noticeable difference)
model, the NASA DVQ (Digital Video Quality) (Watson
1998
) model, and SSIM
(Wang et al.
2004
), but their applications are also very limited.
2.5 Summary
In this chapter, we have introduced some basic knowledge about video coding, includ-
ing color space, video format, video coding tools, and quality measurement. They
are not independent but closely related to each other. Color space provides the rep-
resentation of the captured image signal. The color space conversion from RGB to
YUV with UV downsampled is also an efficient way of data reduction. As the input
source of a video codec, it also affects the development of coding tools. Moreover,
the quality metric is not only an issue of quality evaluation, but also closely related
to the selection of coding tools.
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